Sliding fastener



Nov. l0, 1931. M. KRAKowsKY 1,831,570

' SLIDING FASTENER Filed April 14.19:so

Y wm* if V a fm 4Plasma Nv.'1o, 1931 i rable fasteners.

" States, Serial N o.

" with the mounted on, but within the UNITED STATESI PATENT OFFICE MORITZ KRAXOWSKY, F OFFENBAUH-ONTHEMAIN, GERMANY SLIDING FASTENER Application :Med April 14, 1930, Serial No.

My invention relates to sliding or sepa- It is an object of my invention to provide an improved slidingcam for such fasteners.

To this end I provide recessed members in combination with a cam which 1s adapted to enter the recessed portions of the members.

In a preferred embodiment of my lnvention I the cam which are adapted to enter correspondlng recesses in the members.

In sliding fasteners as heretofore deslgned vand as described, for instance, in my co-pendin the United 409,642, the sliding cam is so desi ed as to engage the members at either si e, and as a rule the cam is equipped with plates: which are guided on the inner and outer. faces of the members. In this typ of fastener the parts to be connected are su jected to wear by the cam and in said copend mg application I' have described lugs on the members which increase the depth that the edges of the cam-will not interfere parts to be connected. This solution, although it eliminates the wear, is still open to improvement as it is comparatively complicated, increases the tates a considerable overall depth of the fastener. Besides, the lower face of the fastener may cause damage to adjacent parts when it is moved.

These drawbacks are eliminated according to my invention in which the cam is not members and is ing application for patent practically invisible.

p rotecte by the members which at the sante A cam according to my invention is not a hollow part of considerable depth, as in the fastenersreferred to, but a flat plate which, as mentioned, may be equipped with camming; ribs at the sides. A cam of this type is muc smaller and also much simpler than the cams referred to without in any way sacrificing reliability. On the contrary, the reliability vof the cam is increased as it is tlme prevent dama thro h the movement of the cam.

In t e drawings a'lixedto this specification and forming part thereof a sliding fastener ge to adjacent parts provide camming ribs at the sides of the sides of the cam e.

thereof so.

cost and necessi- 444,090, and in Germany July 8, 1929.

embodying my invention is illustrated diagra-mmatically by way of example.

In the drawings Fig. l is an elevation Fig. 2 is a section Fig.v 1, with the cam omitted,

Fig. 3 is a plan view,

Fig. 4 is a side elevation, and

Fig. 5 is a front-end elevation of the cam.

eferring' now to the drawings, b, Z) are a 60 pair of stringers with reinforced or beaded edges, a, a are the locking members which are identical as to shape and are secured to the stringers b, b in the usual manner, c, c are reccsses in the members which are adapted to receive the cam e, and d are camming ribs at In the present instance the recesses in the members a and the corresponding parts at the sides of the cam e have the shape of the letter Y placed hori- I0 zontally. This shape has the advantage that the edges of the stringers may be in very close vicinity to the edges of the cam so that there are no appreciable gaps. However, I am not limited to theY shape of the recesses.

f is a ring in a slotted rib g on the cam e.

In operation the cam is pulled along the members a by the ring fand as it is moving its camming ribs a? move the several members a as required, Without separate wedging parts. The members engage each other in the usual manner and by means of the usual. projections, as will appear from Fig. 1.

I wish it to be understood that I do not desire to be limited to the exact details of S5 construction shown and described for obvious modifications will occur to a person skilled in the art.

, 1. A sliding fastener comprising two rows of interlocking members secured to opposite edges of a closure, said members being formed with recesses extending from the free ends of said members and increasing in width in the direction' towards the edges of the 95 closure, and a cam having sliding motion Within said recesses for causing the engage ment and disengagement of said members.

2. A sliding fastener' comprising' two rows of interlocking members secured to opposite of the fastener,

'disengagement of said'members.

edges of a closure, Asaid members being formed with recesses extending from the free ends of said members and increasing 1n width closure, a cain having sliding motion within 'said receses for causlng the engagement and iding fastener comprising two rows of interlocking members secured to opposite edges of a closure, said members being formed with Y-shaped recesses extending from the free ends of said members towards the edges of the closure and a'cam havmg sliding motion within said recesses for causing the engagement and disengagement of sai members.

In testimony whereof I aiiix m si ature Y MORITZ KRAKW KY.

1,es1,57o

'in the direction towards the edges of the' 

